Vitamin Supplements

Vitamin D is not like other vitamins. Because the body can manufacture this nutrient, in fact, vitamin D fails to meet the classic definition of a vitamin. Vitamin D is manufactured in the skin, with ultraviolet light driving the process. With regular exposure to sunlight, most people can manufacture enough of this vitamin to meet all of their needs. People who do not get enough year-round exposure, however, may require dietary D as well. Certain groups, including older people, have difficulty producing vitamin D themselves and may also require dietary D.

While rickets, a disease caused by a vitamin D deficiency, has been around for thousands of years, our knowledge of the vitamin itself has a relatively short history. It was first isolated and synthesized. Read the rest of this entry »

If you answer yes to any of the following questions, you (or your child) have an above-average risk of developing a vitamin D deficiency.

• Are you an older person? Skin production of vitamin D tends to slow down with age. Studies of older people—particularly older women—show that as many as 75 percent are at marked risk for vitamin D deficiencies.
• Are you confined indoors and not exposed to sunlight? With limited sun exposure, your skin will produce a minimal amount of vitamin D, leaving you to rely on diet alone for your vitamin D needs.
• Do you have kidney or liver disease? Vitamin D, formed in the skin, must be modified chemically in the kidney and liver before the body can use it. This process can be severely impaired if these organs are diseased. Read the rest of this entry »